Analysis
- max time kernel
58s - max time network
63s - platform
windows7_x64 - resource
win7-20220901-en - resource tags
- submitted
08/12/2022, 01:17
General
- Target file.exe
- Size 2.2MB
- Sample221208-bndejagf77
- SHA256 9372d7189bfa840e3e9de05b271c54d1df422054b6ed46ff4af1c4e54aefdf11
Malware Config
Extracted
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nymaim
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45.139.105.171
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85.31.46.167
Signatures
- NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
- Executes dropped EXE 3 IoCs
- Loads dropped DLL 10 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Drops file in Program Files directory 9 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Kills process with taskkill 1 IoCs
- Suspicious behavior: EnumeratesProcesses 3 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of WriteProcessMemory 35 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\is-ANH53.tmp\is-11H2C.tmp"C:\Users\Admin\AppData\Local\Temp\is-ANH53.tmp\is-11H2C.tmp" /SL4 $A0150 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2043508 737282⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\PrintFolders\RintFolders.exe"C:\Program Files (x86)\PrintFolders\RintFolders.exe"3⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\q9H6K2C9XsK.exe4⤵
- Executes dropped EXE
- Loads dropped DLL
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "RintFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\RintFolders.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im "RintFolders.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
RintFolders.exe
RintFolders.exe
is-11H2C.tmp
is-11H2C.tmp
q9H6K2C9XsK.exe
q9H6K2C9XsK.exe
RintFolders.exe
RintFolders.exe
RintFolders.exe
_iscrypt.dll
_shfoldr.dll
_shfoldr.dll
is-11H2C.tmp
q9H6K2C9XsK.exe
q9H6K2C9XsK.exe
q9H6K2C9XsK.exe
memory/1352-97-0x0000000000400000-0x0000000000418000-memory.dmp
memory/1352-55-0x0000000000400000-0x0000000000418000-memory.dmp
memory/1352-54-0x0000000075B51000-0x0000000075B53000-memory.dmp
memory/1352-66-0x0000000000400000-0x0000000000418000-memory.dmp
memory/1704-86-0x0000000003090000-0x00000000041DA000-memory.dmp
memory/1704-73-0x0000000003090000-0x00000000041DA000-memory.dmp
memory/2024-78-0x0000000000400000-0x000000000154A000-memory.dmp
memory/2024-74-0x0000000001BA0000-0x0000000002CEA000-memory.dmp
memory/2024-87-0x0000000010000000-0x000000001001B000-memory.dmp
memory/2024-91-0x0000000000400000-0x000000000154A000-memory.dmp
memory/2024-77-0x0000000000400000-0x000000000154A000-memory.dmp
memory/2024-76-0x0000000000400000-0x000000000154A000-memory.dmp
memory/2024-96-0x0000000000400000-0x000000000154A000-memory.dmp
memory/2024-75-0x0000000001BA0000-0x0000000002CEA000-memory.dmp